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Diagnostic value of tachycardia features and pacing maneuvers during paroxysmal supraventricular tachycardia

^a Department of Internal Medicine, Division of Cardiology, University of Michigan Health System, Ann Arbor, Michigan, USA

View larger version (17K): [in a new window]   Figure 1 Example of the first diagnostic pacing maneuver. Shown are surface electrograms I, II, III, V1, and intracardiac recordings from the high right atrium (HRA), His-bundle electrogram (HBE), and right ventricular apex (RVA). The tachycardia is entrained with atrial pacing. The VA interval of the return beat is the same as the VA interval of the tachycardia. This observation, referred to as "VA linking," would not be expected during atrial tachycardia because atrial activation is not dependent on ventricular activation. S = stimulus.

View larger version (19K): [in a new window]   Figure 2 Example of the fourth diagnostic pacing maneuver. The format is the same as Figure 1. A burst of ventricular pacing is delivered during tachycardia. The tachycardia terminates without depolarization of the atrium. The last beat of the tachycardia is denoted with an asterisk. This observation excludes atrial tachycardia. S = stimulus.